docs: Document asyncio.TimeoutError for WebSocketResponse.receive methods (#12042)

Author: veeceey

CHANGES/12042.doc.rst

@@ -0,0 +1,2 @@
+Documented :exc:`asyncio.TimeoutError` for ``WebSocketResponse.receive()``
+and related methods -- by :user:`veeceey`.

docs/web_reference.rst

@@ -1275,6 +1275,8 @@ and :ref:`aiohttp-web-signals` handlers::
 
       :raise RuntimeError: if connection is not started
 
+      :raise asyncio.TimeoutError: if timeout expires before receiving a message
+
    .. method:: receive_str(*, timeout=None)
       :async:
 
@@ -1293,6 +1295,8 @@ and :ref:`aiohttp-web-signals` handlers::
 
       :raise aiohttp.WSMessageTypeError: if message is not :const:`~aiohttp.WSMsgType.TEXT`.
 
+      :raise asyncio.TimeoutError: if timeout expires before receiving a message
+
    .. method:: receive_bytes(*, timeout=None)
       :async:
 
@@ -1312,6 +1316,8 @@ and :ref:`aiohttp-web-signals` handlers::
 
       :raise aiohttp.WSMessageTypeError: if message is not :const:`~aiohttp.WSMsgType.BINARY`.
 
+      :raise asyncio.TimeoutError: if timeout expires before receiving a message
+
    .. method:: receive_json(*, loads=json.loads, timeout=None)
       :async:
 
@@ -1335,6 +1341,7 @@ and :ref:`aiohttp-web-signals` handlers::
 
       :raise TypeError: if message is :const:`~aiohttp.WSMsgType.BINARY`.
       :raise ValueError: if message is not valid JSON.
+      :raise asyncio.TimeoutError: if timeout expires before receiving a message
 
 
 .. seealso:: :ref:`WebSockets handling<aiohttp-web-websockets>`